LASER SPECTROSCOPIC INVESTIGATION OF THE VANDERWAALS MOLECULE NAXE

The electronic transition A2Π ← X2Σ of the van der Waals molecule NaXe has been investigated by means of high-resolution laser spectroscopy in a supersonic jet. By applying the method of optical-optical double-resonance, a rotational analysis could be performed for the three isotopomers Na129Xe, Na131Xe, and Na132Xe. Spectroscopic parameters have been derived for the vibrational levels 0 of the XΣ state and 10-16 of the AΠ states. In addition, the spectral distribution of the fluorescence light has been observed. The interatomic potentials of the XΣ and the AΠ states have been determined from the experimental data by means of a quantum-mechanical method of approach using analytical Tang-Toennies, Thakkar, or HFD functions. For the equilibrium distance and the well depth we obtain 4.95(4) Å, 3.20(5) Å, 3.22(5) Å, and 117(15) cm-1, 1215(35) cm-1, and 1120(35) cm-1 for XΣ, AΠ 1 2, and AΠ 3 2, respectively. © 1992.